Relevance equation doesn't work if question code is a number
1 year 10 months ago #95164

I agree it is a hidden, but when you go to the QA page in LimeSurvey, you should see a warning about the invalid question code. I think the edit question screen should give a warning about question codes being duplicate or invalid. It is on the radar for future development. If you find a place where you think it should be in the manual, feel free to place it there yourself (it is a wiki).